Learn about Mercury, the smallest and innermost planet in the solar system, with a short year and a long day. Find out how it was named, what it looks like, and how it was studied by Messenger and BepiColombo probes.

Mercury is the smallest planet in our solar system and the nearest to the Sun. Mercury is only slightly larger than Earth's Moon. Its surface is covered in tens of thousands of impact craters.

Mercury is the smallest planet in the Solar System. One of five planets visible with the naked eye a, Mercury is just 4,879 Kilometres across its equator, compared with 12,742 Kilometres for the Earth.

The smallest planet in our solar system and nearest to the Sun, Mercury is only slightly larger than Earth's Moon. From the surface of Mercury, the Sun would appear more than three times as large as it does when viewed from Earth, and the sunlight would be as much as seven times brighter.

Learn about Mercury, the smallest and fastest planet in our solar system. Find out how it looks, how it spins, what it is made of, and how we have explored it.

Learn about the smallest, fastest, and most elusive planet in our solar system. Find out how Mercury was formed, what its surface looks like, and what missions have explored it.

Learn about Mercury's size, temperature, surface, magnetic field, atmosphere, orbit and more. Find out how Mercury's interior, history and exploration have shaped its features and mysteries.

Mercury is the closest planet to the Sun and the smallest planet in the Solar System. It gets its name for the Roman god Mercury, who was the swift messenger of the gods. It’s an apt name, since Mercury is also the fastest planet, orbiting the Sun in just 88 days.

Although Mercury is the closest planet to the Sun, it isn’t the hottest one (Venus is). Do you know which object is the coldest, the biggest, or the fastest in the Solar System? Which planet hosts the highest mountain, and where is the largest ocean of liquid water (spoiler: not on the Earth)?